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[FAQ]

Unless one is willing to accept the different value of yield stress in one of the directions, the consistent condition will never be met. If both the elastic and plastic responses of the material are completely isotropic, and the only is difference is yield stress in tension and compression, then use the cast iron option to mimic the behavior by using TB,CAST,1 tbdata,1,0.5 TB,uniaxil,1,,,TENSION tbpt,,,, TB,uniaxil,1,,,COMPRESSION tbpt,,,, ADDITIONAL DETAILS: The option of using tb,cast option was suggested as the properties of this material are very close to isotropic in both elasticity and plasticity. The only special thing here is that they have difference yield stress and tension and compression. It is actually not really an orthotropic material, which is why it was suggested to use the cast option with plastic Poisson’s to 0.5. This will ignore the Rankin yield surface assumption in cast iron and is a purely Von-Mises yield surface in tension and compression. The cast iron option allows different tension and compression behavior, and it is what we want here. So if a user has an isotropic material but with different yields in tension and compression, they should use TB,CAST with Poisson=0.5.